| 摘要 |
PROBLEM TO BE SOLVED: To provide an Ni-based forged alloy that is excellent in high-temperature strength, is excellent in productivity of a large steel ingot due to low occurrence of segregation and is excellent in workability upon hot forging, rolling, etc., by adjusting the amount of segregation elements added, and a gas turbine using the same.SOLUTION: The Ni-based forged alloy comprises, by mass, 0.001-0.1% C, 0.001-0.01% B, 16-22% Cr, 0.5-1.5% Al, 0.1-6.0% W, 3.5-5.5% Nb, 0.8-3.0% Ti, 16-20% Fe, ≤2.0% Mo and the balance being Ni and unavoidable impurities, wherein a parameter Ps showing a tendency of segregation, which is represented by formula (1): Ps=1.05×(amount of Al)+0.6×(amount of Ti)-0.8×(amount of Nb)-0.3×(amount of Mo), is within the range of Ps≥-3.0, and the sum of W and Mo in atom% is ≤1.75%. |
